We look at the division of 603524 by 9 
The aim is to understand the frequency of 9 in 603524.

Let's proceed to step 1:
6 divided by 9 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 9

On to step 2:
9 goes into 60 6 times with a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 6.0
The remainder is 6 after subtracting 54 from 60.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 9

Step 3:
9 goes into 63 7 times with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 67.0
Subtract 63 from 63 to get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 9

Let's proceed to step 4:
The number 9 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 670.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 9

Moving on to step 5:
9 goes into 52 5 times with a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 6705.0
If we take 45 away from 52, we end up with 7.
Bring next digit (4) of the dividend behind the 7 and repeat the process: 74 / 9

Let's proceed to step 6:
If we divide 74 by 9, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 67058.0
The remainder is 2 after subtracting 72 from 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
When dividing 20 by 9, we get 2 with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 67058.2
Subtract 18 from 20 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
When dividing 20 by 9, we get 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 67058.22
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 67058.22 with a remaining 0.002.